Part# AN364-440A
MFR Model# 20085-10
MaterialThreadPart Number
Cad Plated4-40AN364-440A


These precision-made nuts are reliable and economical fastening devices The fiber insert gives a friction grip on the threads of the bolt and holds securely. The AN364 (thin) stop nut is for use in structural applications where the bolt is loaded primarily in shear or in any application where the tensile strength of the regular height AN365 is not required. Cad stop nuts are furnished to military specifications. Stainless is furnished to military specification.

AN364 (supersedes MS21083) - cad plated stop nuts
AN365 (supersedes MS21044) - cad plated stop nuts
Click here for AN365 Stop Nuts
California Prop 65 Warning Symbol

WARNING: Cancer and Reproductive Harm -

  • Frequently Purchased With
  • Customers Also Viewed
  • Related Items


Its the company. For AN products, you can always depend upon Aircraft Spruce.

Alan S
May 23, 2021


Jerry Z
March 24, 2021

Worked well

Steven R
February 23, 2021


Mike L
October 21, 2020

It works!

September 30, 2020


Sport I
November 15, 2019


Sport I
November 15, 2019


Larry W
August 24, 2019

Common high grade commercial fastener.

Gari M
May 6, 2019

Quality hardware from and excellent supplier-Aircraft Spruce!

Curt B
May 21, 2018


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: on the part manual for a cherokee it asks for part number MS20364-1032C, what is the C stand for?

C after the -1032 will indicate that this is a all-metal stop nut. You will need to go with a MS21042 series nut. MS21042-3 will be the correct cross reference part for your MS20364-1032C. You could also order part # 04-01359 which is a MS20364-1032C THIN HEX NUT.

Q: My application requires a AN364-1216A. What does the A stand for? Will the AN364-1216 work in this application?

"A" stands for non metallic insert, or elastic/nylon lock nut. They are the same part, we just drop the "a" in our system.

Q: The Piper parts manual calls for (nut) MS20365-1032C. No hits on the search. Do you have a replacement?

Use MS21044N3 or AN365-1032

View in Catalog

View Image View in Catalog